EditRelationHandler.java

/*
 * Copyright (c) 2012 Data Harmonisation Panel
 * 
 * All rights reserved. This program and the accompanying materials are made
 * available under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the License,
 * or (at your option) any later version.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution. If not, see <http://www.gnu.org/licenses/>.
 * 
 * Contributors:
 *     HUMBOLDT EU Integrated Project #030962
 *     Data Harmonisation Panel <http://www.dhpanel.eu>
 */

package eu.esdihumboldt.hale.ui.function.internal;

import java.text.MessageFormat;
import java.util.List;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.commands.IHandler;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.wizard.WizardDialog;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.handlers.HandlerUtil;

import de.fhg.igd.eclipse.util.extension.ExtensionObjectFactoryCollection;
import de.fhg.igd.eclipse.util.extension.FactoryFilter;
import de.fhg.igd.slf4jplus.ALogger;
import de.fhg.igd.slf4jplus.ALoggerFactory;
import eu.esdihumboldt.hale.common.align.extension.function.FunctionDefinition;
import eu.esdihumboldt.hale.common.align.extension.function.FunctionUtil;
import eu.esdihumboldt.hale.common.align.extension.function.TypeFunction;
import eu.esdihumboldt.hale.common.align.model.Cell;
import eu.esdihumboldt.hale.common.align.model.MutableCell;
import eu.esdihumboldt.hale.ui.HaleUI;
import eu.esdihumboldt.hale.ui.function.FunctionWizard;
import eu.esdihumboldt.hale.ui.function.extension.FunctionWizardDescriptor;
import eu.esdihumboldt.hale.ui.function.extension.FunctionWizardExtension;
import eu.esdihumboldt.hale.ui.function.extension.FunctionWizardFactory;
import eu.esdihumboldt.hale.ui.function.generic.GenericPropertyFunctionWizard;
import eu.esdihumboldt.hale.ui.function.generic.GenericTypeFunctionWizard;
import eu.esdihumboldt.hale.ui.service.align.AlignmentService;
import eu.esdihumboldt.hale.ui.util.wizard.HaleWizardDialog;

/**
 * Handler for editing an existing {@link Cell}.
 * 
 * @author Simon Templer
 */
public class EditRelationHandler extends AbstractHandler {

	private static final ALogger log = ALoggerFactory.getLogger(EditRelationHandler.class);

	/**
	 * @see IHandler#execute(ExecutionEvent)
	 */
	@Override
	public Object execute(ExecutionEvent event) throws ExecutionException {
		ISelection selection = HandlerUtil.getCurrentSelection(event);

		if (selection instanceof IStructuredSelection && !selection.isEmpty()) {
			Object selected = ((IStructuredSelection) selection).getFirstElement();
			if (selected instanceof Cell) {
				final Cell originalCell = (Cell) selected;

				FunctionWizard wizard = null;
				List<FunctionWizardDescriptor<?>> factories = FunctionWizardExtension.getInstance()
						.getFactories(
								new FactoryFilter<FunctionWizardFactory, FunctionWizardDescriptor<?>>() {

									@Override
									public boolean acceptFactory(
											FunctionWizardDescriptor<?> factory) {
										return factory.getFunctionId()
												.equals(originalCell.getTransformationIdentifier());
									}

									@Override
									public boolean acceptCollection(
											ExtensionObjectFactoryCollection<FunctionWizardFactory, FunctionWizardDescriptor<?>> collection) {
										return true;
									}
								});

				if (!factories.isEmpty()) {
					// create registered wizard
					FunctionWizardDescriptor<?> fwd = factories.get(0);
					wizard = fwd.createEditWizard(originalCell);
				}

				if (wizard == null) {
					FunctionDefinition<?> function = FunctionUtil.getFunction(
							originalCell.getTransformationIdentifier(),
							HaleUI.getServiceProvider());
					if (function == null) {
						log.userError(
								MessageFormat.format("Function with identifier ''{0}'' is unknown.",
										originalCell.getTransformationIdentifier()));
						return null;
					}
					// create generic wizard
					if (function instanceof TypeFunction) {
						wizard = new GenericTypeFunctionWizard(originalCell);
					}
					else {
						wizard = new GenericPropertyFunctionWizard(originalCell);
					}
				}

				// initialize wizard
				wizard.init();

				HaleWizardDialog dialog = new HaleWizardDialog(HandlerUtil.getActiveShell(event),
						wizard);

				if (dialog.open() == WizardDialog.OK) {
					MutableCell cell = wizard.getResult();

					AlignmentService alignmentService = PlatformUI.getWorkbench()
							.getService(AlignmentService.class);
					// remove the original cell
					// and add the new cell
					alignmentService.replaceCell(originalCell, cell);
				}
			}
		}

		return null;
	}

}